<?php

namespace think\db;

use PDO;
use think\Cache;
use think\Collection;
use think\Config;
use think\Db;
use think\db\exception\BindParamException;
use think\db\exception\DataNotFoundException;
use think\db\exception\ModelNotFoundException;
use think\Exception;
use think\exception\DbException;
use think\exception\PDOException;
use think\Loader;
use think\Model;
use think\model\Relation;
use think\model\relation\OneToOne;
use think\Paginator;

class Query
{
  // 数据库Connection对象实例
  protected $connection;
  // 数据库Builder对象实例
  protected $builder;
  // 当前模型类名称
  protected $model;
  // 当前数据表名称（含前缀）
  protected $table = '';
  // 当前数据表名称（不含前缀）
  protected $name = '';
  // 当前数据表主键
  protected $pk;
  // 当前数据表前缀
  protected $prefix = '';
  // 查询参数
  protected $options = [];
  // 参数绑定
  protected $bind = [];
  // 数据表信息
  protected static $info = [];
  // 回调事件
  private static $event = [];

  /**
   * 架构函数
   * @access public
   * @param Connection $connection 数据库对象实例
   * @param string     $model      模型名
   */
  public function __construct(Connection $connection = null, $model = '')
  {
    $this->connection = $connection ?: Db::connect([], true);
    $this->prefix     = $this->connection->getConfig('prefix');
    $this->model      = $model;
    // 设置当前连接的Builder对象
    $this->setBuilder();
  }

  /**
   * 利用__call方法实现一些特殊的Model方法
   * @access public
   * @param string $method 方法名称
   * @param array  $args   调用参数
   * @return mixed
   * @throws DbException
   * @throws Exception
   */
  public function __call($method, $args)
  {
    if (strtolower(substr($method, 0, 5)) == 'getby') {
      // 根据某个字段获取记录
      $field         = Loader::parseName(substr($method, 5));
      $where[$field] = $args[0];
      return $this->where($where)->find();
    } elseif (strtolower(substr($method, 0, 10)) == 'getfieldby') {
      // 根据某个字段获取记录的某个值
      $name         = Loader::parseName(substr($method, 10));
      $where[$name] = $args[0];
      return $this->where($where)->value($args[1]);
    } else {
      throw new Exception('method not exist:' . __CLASS__ . '->' . $method);
    }
  }

  /**
   * 获取当前的数据库Connection对象
   * @access public
   * @return Connection
   */
  public function getConnection()
  {
    return $this->connection;
  }

  /**
   * 切换当前的数据库连接
   * @access public
   * @param mixed $config
   * @return $this
   */
  public function connect($config)
  {
    $this->connection = Db::connect($config);
    $this->setBuilder();
    return $this;
  }

  /**
   * 设置当前的数据库Builder对象
   * @access protected
   * @return void
   */
  protected function setBuilder()
  {
    $builder       = $this->connection->getConfig('builder') ?: $this->connection->getConfig('type');
    $class         = false !== strpos($builder, '\\') ? $builder : '\\think\\db\\builder\\' . ucfirst($builder);
    $this->builder = new $class($this->connection, $this);
  }

  /**
   * 获取当前的模型对象名
   * @access public
   * @return string
   */
  public function getModel()
  {
    return $this->model;
  }

  /**
   * 获取当前的builder实例对象
   * @access public
   * @return Builder
   */
  public function getBuilder()
  {
    return $this->builder;
  }

  /**
   * 指定默认的数据表名（不含前缀）
   * @access public
   * @param string $name
   * @return $this
   */
  public function name($name)
  {
    $this->name = $name;
    return $this;
  }

  /**
   * 指定默认数据表名（含前缀）
   * @access public
   * @param string $table 表名
   * @return $this
   */
  public function setTable($table)
  {
    $this->table = $table;
    return $this;
  }

  /**
   * 得到当前或者指定名称的数据表
   * @access public
   * @param string $name
   * @return string
   */
  public function getTable($name = '')
  {
    if ($name || empty($this->table)) {
      $name      = $name ?: $this->name;
      $tableName = $this->prefix;
      if ($name) {
        $tableName .= Loader::parseName($name);
      }
    } else {
      $tableName = $this->table;
    }
    return $tableName;
  }

  /**
   * 将SQL语句中的__TABLE_NAME__字符串替换成带前缀的表名（小写）
   * @access public
   * @param string $sql sql语句
   * @return string
   */
  public function parseSqlTable($sql)
  {
    if (false !== strpos($sql, '__')) {
      $prefix = $this->prefix;
      $sql    = preg_replace_callback("/__([A-Z0-9_-]+)__/sU", function ($match) use ($prefix) {
        return $prefix . strtolower($match[1]);
      }, $sql);
    }
    return $sql;
  }

  /**
   * 执行查询 返回数据集
   * @access public
   * @param string      $sql    sql指令
   * @param array       $bind   参数绑定
   * @param boolean     $master 是否在主服务器读操作
   * @param bool|string $class  指定返回的数据集对象
   * @return mixed
   * @throws BindParamException
   * @throws PDOException
   */
  public function query($sql, $bind = [], $master = false, $class = false)
  {
    return $this->connection->query($sql, $bind, $master, $class);
  }

  /**
   * 执行语句
   * @access public
   * @param string $sql  sql指令
   * @param array  $bind 参数绑定
   * @return int
   * @throws BindParamException
   * @throws PDOException
   */
  public function execute($sql, $bind = [])
  {
    return $this->connection->execute($sql, $bind);
  }

  /**
   * 获取最近插入的ID
   * @access public
   * @param string $sequence 自增序列名
   * @return string
   */
  public function getLastInsID($sequence = null)
  {
    return $this->connection->getLastInsID($sequence);
  }

  /**
   * 获取最近一次查询的sql语句
   * @access public
   * @return string
   */
  public function getLastSql()
  {
    return $this->connection->getLastSql();
  }

  /**
   * 执行数据库事务
   * @access public
   * @param callable $callback 数据操作方法回调
   * @return mixed
   */
  public function transaction($callback)
  {
    return $this->connection->transaction($callback);
  }

  /**
   * 启动事务
   * @access public
   * @return void
   */
  public function startTrans()
  {
    $this->connection->startTrans();
  }

  /**
   * 用于非自动提交状态下面的查询提交
   * @access public
   * @return void
   * @throws PDOException
   */
  public function commit()
  {
    $this->connection->commit();
  }

  /**
   * 事务回滚
   * @access public
   * @return void
   * @throws PDOException
   */
  public function rollback()
  {
    $this->connection->rollback();
  }

  /**
   * 批处理执行SQL语句
   * 批处理的指令都认为是execute操作
   * @access public
   * @param array $sql SQL批处理指令
   * @return boolean
   */
  public function batchQuery($sql = [])
  {
    return $this->connection->batchQuery($sql);
  }

  /**
   * 获取数据库的配置参数
   * @access public
   * @param string $name 参数名称
   * @return boolean
   */
  public function getConfig($name = '')
  {
    return $this->connection->getConfig($name);
  }

  /**
   * 得到分表的的数据表名
   * @access public
   * @param array  $data  操作的数据
   * @param string $field 分表依据的字段
   * @param array  $rule  分表规则
   * @return string
   */
  public function getPartitionTableName($data, $field, $rule = [])
  {
    // 对数据表进行分区
    if ($field && isset($data[$field])) {
      $value = $data[$field];
      $type  = $rule['type'];
      switch ($type) {
        case 'id':
          // 按照id范围分表
          $step = $rule['expr'];
          $seq  = floor($value / $step) + 1;
          break;
        case 'year':
          // 按照年份分表
          if (!is_numeric($value)) {
            $value = strtotime($value);
          }
          $seq = date('Y', $value) - $rule['expr'] + 1;
          break;
        case 'mod':
          // 按照id的模数分表
          $seq = ($value % $rule['num']) + 1;
          break;
        case 'md5':
          // 按照md5的序列分表
          $seq = (ord(substr(md5($value), 0, 1)) % $rule['num']) + 1;
          break;
        default:
          if (function_exists($type)) {
            // 支持指定函数哈希
            $seq = (ord(substr($type($value), 0, 1)) % $rule['num']) + 1;
          } else {
            // 按照字段的首字母的值分表
            $seq = (ord($value{
            0}) % $rule['num']) + 1;
          }
      }
      return $this->getTable() . '_' . $seq;
    } else {
      // 当设置的分表字段不在查询条件或者数据中
      // 进行联合查询，必须设定 partition['num']
      $tableName = [];
      for ($i = 0; $i < $rule['num']; $i++) {
        $tableName[] = 'SELECT * FROM ' . $this->getTable() . '_' . ($i + 1);
      }

      $tableName = '( ' . implode(" UNION ", $tableName) . ') AS ' . $this->name;
      return $tableName;
    }
  }

  /**
   * 得到某个字段的值
   * @access public
   * @param string $field   字段名
   * @param mixed  $default 默认值
   * @param bool   $force   强制转为数字类型
   * @return mixed
   */
  public function value($field, $default = null, $force = false)
  {
    $result = false;
    if (empty($options['fetch_sql']) && !empty($this->options['cache'])) {
      // 判断查询缓存
      $cache = $this->options['cache'];
      if (empty($this->options['table'])) {
        $this->options['table'] = $this->getTable();
      }
      $key    = is_string($cache['key']) ? $cache['key'] : md5($field . serialize($this->options));
      $result = Cache::get($key);
    }
    if (false === $result) {
      if (isset($this->options['field'])) {
        unset($this->options['field']);
      }
      $pdo = $this->field($field)->limit(1)->getPdo();
      if (is_string($pdo)) {
        // 返回SQL语句
        return $pdo;
      }
      $result = $pdo->fetchColumn();
      if ($force) {
        $result = is_numeric($result) ? $result + 0 : $result;
      }
      if (isset($cache)) {
        // 缓存数据
        if (isset($cache['tag'])) {
          Cache::tag($cache['tag'])->set($key, $result, $cache['expire']);
        } else {
          Cache::set($key, $result, $cache['expire']);
        }
      }
    } else {
      // 清空查询条件
      $this->options = [];
    }
    return false !== $result ? $result : $default;
  }

  /**
   * 得到某个列的数组
   * @access public
   * @param string $field 字段名 多个字段用逗号分隔
   * @param string $key   索引
   * @return array
   */
  public function column($field, $key = '')
  {
    $result = false;
    if (empty($options['fetch_sql']) && !empty($this->options['cache'])) {
      // 判断查询缓存
      $cache = $this->options['cache'];
      if (empty($this->options['table'])) {
        $this->options['table'] = $this->getTable();
      }
      $guid   = is_string($cache['key']) ? $cache['key'] : md5($field . serialize($this->options));
      $result = Cache::get($guid);
    }
    if (false === $result) {
      if (isset($this->options['field'])) {
        unset($this->options['field']);
      }
      if ($key && '*' != $field) {
        $field = $key . ',' . $field;
      }
      $pdo = $this->field($field)->getPdo();
      if (is_string($pdo)) {
        // 返回SQL语句
        return $pdo;
      }
      if (1 == $pdo->columnCount()) {
        $result = $pdo->fetchAll(PDO::FETCH_COLUMN);
      } else {
        $resultSet = $pdo->fetchAll(PDO::FETCH_ASSOC);
        if ($resultSet) {
          $fields = array_keys($resultSet[0]);
          $count  = count($fields);
          $key1   = array_shift($fields);
          $key2   = $fields ? array_shift($fields) : '';
          $key    = $key ?: $key1;
          if (strpos($key, '.')) {
            list($alias, $key) = explode('.', $key);
          }
          foreach ($resultSet as $val) {
            if ($count > 2) {
              $result[$val[$key]] = $val;
            } elseif (2 == $count) {
              $result[$val[$key]] = $val[$key2];
            } elseif (1 == $count) {
              $result[$val[$key]] = $val[$key1];
            }
          }
        } else {
          $result = [];
        }
      }
      if (isset($cache) && isset($guid)) {
        // 缓存数据
        if (isset($cache['tag'])) {
          Cache::tag($cache['tag'])->set($guid, $result, $cache['expire']);
        } else {
          Cache::set($guid, $result, $cache['expire']);
        }
      }
    } else {
      // 清空查询条件
      $this->options = [];
    }
    return $result;
  }

  /**
   * COUNT查询
   * @access public
   * @param string $field 字段名
   * @return integer|string
   */
  public function count($field = '*')
  {
    if (isset($this->options['group'])) {
      // 支持GROUP
      $options = $this->getOptions();
      $subSql  = $this->options($options)->field('count(' . $field . ')')->bind($this->bind)->buildSql();
      return $this->table([$subSql => '_group_count_'])->value('COUNT(*) AS tp_count', 0, true);
    }

    return $this->value('COUNT(' . $field . ') AS tp_count', 0, true);
  }

  /**
   * SUM查询
   * @access public
   * @param string $field 字段名
   * @return float|int
   */
  public function sum($field)
  {
    return $this->value('SUM(' . $field . ') AS tp_sum', 0, true);
  }

  /**
   * MIN查询
   * @access public
   * @param string $field 字段名
   * @return mixed
   */
  public function min($field)
  {
    return $this->value('MIN(' . $field . ') AS tp_min', 0, true);
  }

  /**
   * MAX查询
   * @access public
   * @param string $field 字段名
   * @return mixed
   */
  public function max($field)
  {
    return $this->value('MAX(' . $field . ') AS tp_max', 0, true);
  }

  /**
   * AVG查询
   * @access public
   * @param string $field 字段名
   * @return float|int
   */
  public function avg($field)
  {
    return $this->value('AVG(' . $field . ') AS tp_avg', 0, true);
  }

  /**
   * 设置记录的某个字段值
   * 支持使用数据库字段和方法
   * @access public
   * @param string|array $field 字段名
   * @param mixed        $value 字段值
   * @return integer
   */
  public function setField($field, $value = '')
  {
    if (is_array($field)) {
      $data = $field;
    } else {
      $data[$field] = $value;
    }
    return $this->update($data);
  }

  /**
   * 字段值(延迟)增长
   * @access public
   * @param string  $field    字段名
   * @param integer $step     增长值
   * @param integer $lazyTime 延时时间(s)
   * @return integer|true
   * @throws Exception
   */
  public function setInc($field, $step = 1, $lazyTime = 0)
  {
    $condition = !empty($this->options['where']) ? $this->options['where'] : [];
    if (empty($condition)) {
      // 没有条件不做任何更新
      throw new Exception('no data to update');
    }
    if ($lazyTime > 0) {
      // 延迟写入
      $guid = md5($this->getTable() . '_' . $field . '_' . serialize($condition));
      $step = $this->lazyWrite('inc', $guid, $step, $lazyTime);
      if (false === $step) {
        // 清空查询条件
        $this->options = [];
        return true;
      }
    }
    return $this->setField($field, ['exp', $field . '+' . $step]);
  }

  /**
   * 字段值（延迟）减少
   * @access public
   * @param string  $field    字段名
   * @param integer $step     减少值
   * @param integer $lazyTime 延时时间(s)
   * @return integer|true
   * @throws Exception
   */
  public function setDec($field, $step = 1, $lazyTime = 0)
  {
    $condition = !empty($this->options['where']) ? $this->options['where'] : [];
    if (empty($condition)) {
      // 没有条件不做任何更新
      throw new Exception('no data to update');
    }
    if ($lazyTime > 0) {
      // 延迟写入
      $guid = md5($this->getTable() . '_' . $field . '_' . serialize($condition));
      $step = $this->lazyWrite('dec', $guid, $step, $lazyTime);
      if (false === $step) {
        // 清空查询条件
        $this->options = [];
        return true;
      }
    }
    return $this->setField($field, ['exp', $field . '-' . $step]);
  }

  /**
   * 延时更新检查 返回false表示需要延时
   * 否则返回实际写入的数值
   * @access protected
   * @param string  $type     自增或者自减
   * @param string  $guid     写入标识
   * @param integer $step     写入步进值
   * @param integer $lazyTime 延时时间(s)
   * @return false|integer
   */
  protected function lazyWrite($type, $guid, $step, $lazyTime)
  {
    if (!Cache::has($guid . '_time')) {
      // 计时开始
      Cache::set($guid . '_time', $_SERVER['REQUEST_TIME'], 0);
      Cache::$type($guid, $step, 0);
    } elseif ($_SERVER['REQUEST_TIME'] > Cache::get($guid . '_time') + $lazyTime) {
      // 删除缓存
      $value = Cache::$type($guid, $step, 0);
      Cache::rm($guid);
      Cache::rm($guid . '_time');
      return 0 === $value ? false : $value;
    } else {
      // 更新缓存
      Cache::$type($guid, $step, 0);
    }
    return false;
  }

  /**
   * 查询SQL组装 join
   * @access public
   * @param mixed  $join      关联的表名
   * @param mixed  $condition 条件
   * @param string $type      JOIN类型
   * @return $this
   */
  public function join($join, $condition = null, $type = 'INNER')
  {
    if (empty($condition)) {
      // 如果为组数，则循环调用join
      foreach ($join as $key => $value) {
        if (is_array($value) && 2 <= count($value)) {
          $this->join($value[0], $value[1], isset($value[2]) ? $value[2] : $type);
        }
      }
    } else {
      $table = $this->getJoinTable($join);

      $this->options['join'][] = [$table, strtoupper($type), $condition];
    }
    return $this;
  }

  /**
   * 获取Join表名及别名 支持
   * ['prefix_table或者子查询'=>'alias'] 'prefix_table alias' 'table alias'
   * @access public
   * @param array|string $join
   * @return array|string
   */
  protected function getJoinTable($join, &$alias = null)
  {
    // 传入的表名为数组
    if (is_array($join)) {
      list($table, $alias) = each($join);
    } else {
      $join = trim($join);
      if (false !== strpos($join, '(')) {
        // 使用子查询
        $table = $join;
      } else {
        $prefix = $this->prefix;
        if (strpos($join, ' ')) {
          // 使用别名
          list($table, $alias) = explode(' ', $join);
        } else {
          $table = $join;
          if (false === strpos($join, '.') && 0 !== strpos($join, '__')) {
            $alias = $join;
          }
        }
        if ($prefix && false === strpos($table, '.') && 0 !== strpos($table, $prefix) && 0 !== strpos($table, '__')) {
          $table = $this->getTable($table);
        }
      }
    }
    if (isset($alias)) {
      if (isset($this->options['alias'][$table])) {
        $table = $table . '@think' . uniqid();
      }
      $table = [$table => $alias];
      $this->alias($table);
    }
    return $table;
  }

  /**
   * 查询SQL组装 union
   * @access public
   * @param mixed   $union
   * @param boolean $all
   * @return $this
   */
  public function union($union, $all = false)
  {
    $this->options['union']['type'] = $all ? 'UNION ALL' : 'UNION';

    if (is_array($union)) {
      $this->options['union'] = array_merge($this->options['union'], $union);
    } else {
      $this->options['union'][] = $union;
    }
    return $this;
  }

  /**
   * 指定查询字段 支持字段排除和指定数据表
   * @access public
   * @param mixed   $field
   * @param boolean $except    是否排除
   * @param string  $tableName 数据表名
   * @param string  $prefix    字段前缀
   * @param string  $alias     别名前缀
   * @return $this
   */
  public function field($field, $except = false, $tableName = '', $prefix = '', $alias = '')
  {
    if (empty($field)) {
      return $this;
    }
    if (is_string($field)) {
      $field = array_map('trim', explode(',', $field));
    }
    if (true === $field) {
      // 获取全部字段
      $fields = $this->getTableInfo($tableName ?: (isset($this->options['table']) ? $this->options['table'] : ''), 'fields');
      $field  = $fields ?: ['*'];
    } elseif ($except) {
      // 字段排除
      $fields = $this->getTableInfo($tableName ?: (isset($this->options['table']) ? $this->options['table'] : ''), 'fields');
      $field  = $fields ? array_diff($fields, $field) : $field;
    }
    if ($tableName) {
      // 添加统一的前缀
      $prefix = $prefix ?: $tableName;
      foreach ($field as $key => $val) {
        if (is_numeric($key)) {
          $val = $prefix . '.' . $val . ($alias ? ' AS ' . $alias . $val : '');
        }
        $field[$key] = $val;
      }
    }

    if (isset($this->options['field'])) {
      $field = array_merge($this->options['field'], $field);
    }
    $this->options['field'] = array_unique($field);
    return $this;
  }

  /**
   * 设置数据
   * @access public
   * @param mixed $field 字段名或者数据
   * @param mixed $value 字段值
   * @return $this
   */
  public function data($field, $value = null)
  {
    if (is_array($field)) {
      $this->options['data'] = isset($this->options['data']) ? array_merge($this->options['data'], $field) : $field;
    } else {
      $this->options['data'][$field] = $value;
    }
    return $this;
  }

  /**
   * 字段值增长
   * @access public
   * @param string|array $field 字段名
   * @param integer      $step  增长值
   * @return $this
   */
  public function inc($field, $step = 1)
  {
    $fields = is_string($field) ? explode(',', $field) : $field;
    foreach ($fields as $field) {
      $this->data($field, ['exp', $field . '+' . $step]);
    }
    return $this;
  }

  /**
   * 字段值减少
   * @access public
   * @param string|array $field 字段名
   * @param integer      $step  增长值
   * @return $this
   */
  public function dec($field, $step = 1)
  {
    $fields = is_string($field) ? explode(',', $field) : $field;
    foreach ($fields as $field) {
      $this->data($field, ['exp', $field . '-' . $step]);
    }
    return $this;
  }

  /**
   * 使用表达式设置数据
   * @access public
   * @param string $field 字段名
   * @param string $value 字段值
   * @return $this
   */
  public function exp($field, $value)
  {
    $this->data($field, ['exp', $value]);
    return $this;
  }

  /**
   * 指定JOIN查询字段
   * @access public
   * @param string|array $table 数据表
   * @param string|array $field 查询字段
   * @param string|array $on    JOIN条件
   * @param string       $type  JOIN类型
   * @return $this
   */
  public function view($join, $field = true, $on = null, $type = 'INNER')
  {
    $this->options['view'] = true;
    if (is_array($join) && is_null($field)) {
      foreach ($join as $key => $val) {
        $this->view($key, $val[0], isset($val[1]) ? $val[1] : null, isset($val[2]) ? $val[2] : 'INNER');
      }
    } else {
      $fields = [];
      $table  = $this->getJoinTable($join, $alias);

      if (true === $field) {
        $fields = $alias . '.*';
      } else {
        if (is_string($field)) {
          $field = explode(',', $field);
        }
        foreach ($field as $key => $val) {
          if (is_numeric($key)) {
            $fields[]                   = $alias . '.' . $val;
            $this->options['map'][$val] = $alias . '.' . $val;
          } else {
            if (preg_match('/[,=\.\'\"\(\s]/', $key)) {
              $name = $key;
            } else {
              $name = $alias . '.' . $key;
            }
            $fields[]                   = $name . ' AS ' . $val;
            $this->options['map'][$val] = $name;
          }
        }
      }
      $this->field($fields);
      if ($on) {
        $this->join($table, $on, $type);
      } else {
        $this->table($table);
      }
    }
    return $this;
  }

  /**
   * 设置分表规则
   * @access public
   * @param array  $data  操作的数据
   * @param string $field 分表依据的字段
   * @param array  $rule  分表规则
   * @return $this
   */
  public function partition($data, $field, $rule = [])
  {
    $this->options['table'] = $this->getPartitionTableName($data, $field, $rule);
    return $this;
  }

  /**
   * 指定AND查询条件
   * @access public
   * @param mixed $field     查询字段
   * @param mixed $op        查询表达式
   * @param mixed $condition 查询条件
   * @return $this
   */
  public function where($field, $op = null, $condition = null)
  {
    $param = func_get_args();
    array_shift($param);
    $this->parseWhereExp('AND', $field, $op, $condition, $param);
    return $this;
  }

  /**
   * 指定OR查询条件
   * @access public
   * @param mixed $field     查询字段
   * @param mixed $op        查询表达式
   * @param mixed $condition 查询条件
   * @return $this
   */
  public function whereOr($field, $op = null, $condition = null)
  {
    $param = func_get_args();
    array_shift($param);
    $this->parseWhereExp('OR', $field, $op, $condition, $param);
    return $this;
  }

  /**
   * 指定XOR查询条件
   * @access public
   * @param mixed $field     查询字段
   * @param mixed $op        查询表达式
   * @param mixed $condition 查询条件
   * @return $this
   */
  public function whereXor($field, $op = null, $condition = null)
  {
    $param = func_get_args();
    array_shift($param);
    $this->parseWhereExp('XOR', $field, $op, $condition, $param);
    return $this;
  }

  /**
   * 指定Null查询条件
   * @access public
   * @param mixed  $field 查询字段
   * @param string $logic 查询逻辑 and or xor
   * @return $this
   */
  public function whereNull($field, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'null', null);
    return $this;
  }

  /**
   * 指定NotNull查询条件
   * @access public
   * @param mixed  $field 查询字段
   * @param string $logic 查询逻辑 and or xor
   * @return $this
   */
  public function whereNotNull($field, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'notnull', null);
    return $this;
  }

  /**
   * 指定Exists查询条件
   * @access public
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereExists($condition, $logic = 'AND')
  {
    $this->options['where'][strtoupper($logic)][] = ['exists', $condition];
    return $this;
  }

  /**
   * 指定NotExists查询条件
   * @access public
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereNotExists($condition, $logic = 'AND')
  {
    $this->options['where'][strtoupper($logic)][] = ['not exists', $condition];
    return $this;
  }

  /**
   * 指定In查询条件
   * @access public
   * @param mixed  $field     查询字段
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereIn($field, $condition, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'in', $condition);
    return $this;
  }

  /**
   * 指定NotIn查询条件
   * @access public
   * @param mixed  $field     查询字段
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereNotIn($field, $condition, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'not in', $condition);
    return $this;
  }

  /**
   * 指定Like查询条件
   * @access public
   * @param mixed  $field     查询字段
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereLike($field, $condition, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'like', $condition);
    return $this;
  }

  /**
   * 指定NotLike查询条件
   * @access public
   * @param mixed  $field     查询字段
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereNotLike($field, $condition, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'not like', $condition);
    return $this;
  }

  /**
   * 指定Between查询条件
   * @access public
   * @param mixed  $field     查询字段
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereBetween($field, $condition, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'between', $condition);
    return $this;
  }

  /**
   * 指定NotBetween查询条件
   * @access public
   * @param mixed  $field     查询字段
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereNotBetween($field, $condition, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'not between', $condition);
    return $this;
  }

  /**
   * 指定Exp查询条件
   * @access public
   * @param mixed  $field     查询字段
   * @param mixed  $condition 查询条件
   * @param string $logic     查询逻辑 and or xor
   * @return $this
   */
  public function whereExp($field, $condition, $logic = 'AND')
  {
    $this->parseWhereExp($logic, $field, 'exp', $condition);
    return $this;
  }

  /**
   * 分析查询表达式
   * @access public
   * @param string                $logic     查询逻辑 and or xor
   * @param string|array|\Closure $field     查询字段
   * @param mixed                 $op        查询表达式
   * @param mixed                 $condition 查询条件
   * @param array                 $param     查询参数
   * @return void
   */
  protected function parseWhereExp($logic, $field, $op, $condition, $param = [])
  {
    $logic = strtoupper($logic);
    if ($field instanceof \Closure) {
      $this->options['where'][$logic][] = is_string($op) ? [$op, $field] : $field;
      return;
    }

    if (is_string($field) && !empty($this->options['via']) && !strpos($field, '.')) {
      $field = $this->options['via'] . '.' . $field;
    }
    if (is_string($field) && preg_match('/[,=\>\<\'\"\(\s]/', $field)) {
      $where[] = ['exp', $field];
      if (is_array($op)) {
        // 参数绑定
        $this->bind($op);
      }
    } elseif (is_null($op) && is_null($condition)) {
      if (is_array($field)) {
        // 数组批量查询
        $where = $field;
        foreach ($where as $k => $val) {
          $this->options['multi'][$logic][$k][] = $val;
        }
      } elseif ($field && is_string($field)) {
        // 字符串查询
        $where[$field]                            = ['null', ''];
        $this->options['multi'][$logic][$field][] = $where[$field];
      }
    } elseif (is_array($op)) {
      $where[$field] = $param;
    } elseif (in_array(strtolower($op), ['null', 'notnull', 'not null'])) {
      // null查询
      $where[$field]                            = [$op, ''];
      $this->options['multi'][$logic][$field][] = $where[$field];
    } elseif (is_null($condition)) {
      // 字段相等查询
      $where[$field] = ['eq', $op];
      if ('AND' != $logic) {
        $this->options['multi'][$logic][$field][] = $where[$field];
      }
    } else {
      $where[$field] = [$op, $condition, isset($param[2]) ? $param[2] : null];
      if ('exp' == strtolower($op) && isset($param[2]) && is_array($param[2])) {
        // 参数绑定
        $this->bind($param[2]);
      }
      // 记录一个字段多次查询条件
      $this->options['multi'][$logic][$field][] = $where[$field];
    }
    if (!empty($where)) {
      if (!isset($this->options['where'][$logic])) {
        $this->options['where'][$logic] = [];
      }
      if (is_string($field) && $this->checkMultiField($field, $logic)) {
        $where[$field] = $this->options['multi'][$logic][$field];
      } elseif (is_array($field)) {
        foreach ($field as $key => $val) {
          if ($this->checkMultiField($key, $logic)) {
            $where[$key] = $this->options['multi'][$logic][$key];
          }
        }
      }
      $this->options['where'][$logic] = array_merge($this->options['where'][$logic], $where);
    }
  }

  /**
   * 检查是否存在一个字段多次查询条件
   * @access public
   * @param string $field 查询字段
   * @param string $logic 查询逻辑 and or xor
   * @return bool
   */
  private function checkMultiField($field, $logic)
  {
    return isset($this->options['multi'][$logic][$field]) && count($this->options['multi'][$logic][$field]) > 1;
  }

  /**
   * 去除某个查询条件
   * @access public
   * @param string $field 查询字段
   * @param string $logic 查询逻辑 and or xor
   * @return $this
   */
  public function removeWhereField($field, $logic = 'AND')
  {
    $logic = strtoupper($logic);
    if (isset($this->options['where'][$logic][$field])) {
      unset($this->options['where'][$logic][$field]);
    }
    return $this;
  }

  /**
   * 去除查询参数
   * @access public
   * @param string|bool $option 参数名 true 表示去除所有参数
   * @return $this
   */
  public function removeOption($option = true)
  {
    if (true === $option) {
      $this->options = [];
    } elseif (is_string($option) && isset($this->options[$option])) {
      unset($this->options[$option]);
    }
    return $this;
  }

  /**
   * 指定查询数量
   * @access public
   * @param mixed $offset 起始位置
   * @param mixed $length 查询数量
   * @return $this
   */
  public function limit($offset, $length = null)
  {
    if (is_null($length) && strpos($offset, ',')) {
      list($offset, $length) = explode(',', $offset);
    }
    $this->options['limit'] = intval($offset) . ($length ? ',' . intval($length) : '');
    return $this;
  }

  /**
   * 指定分页
   * @access public
   * @param mixed $page     页数
   * @param mixed $listRows 每页数量
   * @return $this
   */
  public function page($page, $listRows = null)
  {
    if (is_null($listRows) && strpos($page, ',')) {
      list($page, $listRows) = explode(',', $page);
    }
    $this->options['page'] = [intval($page), intval($listRows)];
    return $this;
  }

  /**
   * 分页查询
   * @param int|array $listRows 每页数量 数组表示配置参数
   * @param int|bool  $simple   是否简洁模式或者总记录数
   * @param array     $config   配置参数
   *                            page:当前页,
   *                            path:url路径,
   *                            query:url额外参数,
   *                            fragment:url锚点,
   *                            var_page:分页变量,
   *                            list_rows:每页数量
   *                            type:分页类名
   * @return \think\Paginator
   * @throws DbException
   */
  public function paginate($listRows = null, $simple = false, $config = [])
  {
    if (is_int($simple)) {
      $total  = $simple;
      $simple = false;
    }
    if (is_array($listRows)) {
      $config   = array_merge(Config::get('paginate'), $listRows);
      $listRows = $config['list_rows'];
    } else {
      $config   = array_merge(Config::get('paginate'), $config);
      $listRows = $listRows ?: $config['list_rows'];
    }

    /** @var Paginator $class */
    $class = false !== strpos($config['type'], '\\') ? $config['type'] : '\\think\\paginator\\driver\\' . ucwords($config['type']);
    $page  = isset($config['page']) ? (int) $config['page'] : call_user_func([
      $class,
      'getCurrentPage',
    ], $config['var_page']);

    $page = $page < 1 ? 1 : $page;

    $config['path'] = isset($config['path']) ? $config['path'] : call_user_func([$class, 'getCurrentPath']);

    if (!isset($total) && !$simple) {
      $options = $this->getOptions();

      unset($this->options['order'], $this->options['limit'], $this->options['page'], $this->options['field']);

      $bind    = $this->bind;
      $total   = $this->count();
      $results = $this->options($options)->bind($bind)->page($page, $listRows)->select();
    } elseif ($simple) {
      $results = $this->limit(($page - 1) * $listRows, $listRows + 1)->select();
      $total   = null;
    } else {
      $results = $this->page($page, $listRows)->select();
    }
    return $class::make($results, $listRows, $page, $total, $simple, $config);
  }

  /**
   * 指定当前操作的数据表
   * @access public
   * @param mixed $table 表名
   * @return $this
   */
  public function table($table)
  {
    if (is_string($table)) {
      if (strpos($table, ')')) {
        // 子查询
      } elseif (strpos($table, ',')) {
        $tables = explode(',', $table);
        $table  = [];
        foreach ($tables as $item) {
          list($item, $alias) = explode(' ', trim($item));
          if ($alias) {
            $this->alias([$item => $alias]);
            $table[$item] = $alias;
          } else {
            $table[] = $item;
          }
        }
      } elseif (strpos($table, ' ')) {
        list($table, $alias) = explode(' ', $table);

        $table = [$table => $alias];
        $this->alias($table);
      }
    } else {
      $tables = $table;
      $table  = [];
      foreach ($tables as $key => $val) {
        if (is_numeric($key)) {
          $table[] = $val;
        } else {
          $this->alias([$key => $val]);
          $table[$key] = $val;
        }
      }
    }
    $this->options['table'] = $table;
    return $this;
  }

  /**
   * USING支持 用于多表删除
   * @access public
   * @param mixed $using
   * @return $this
   */
  public function using($using)
  {
    $this->options['using'] = $using;
    return $this;
  }

  /**
   * 指定排序 order('id','desc') 或者 order(['id'=>'desc','create_time'=>'desc'])
   * @access public
   * @param string|array $field 排序字段
   * @param string       $order 排序
   * @return $this
   */
  public function order($field, $order = null)
  {
    if (!empty($field)) {
      if (is_string($field)) {
        if (!empty($this->options['via'])) {
          $field = $this->options['via'] . '.' . $field;
        }
        $field = empty($order) ? $field : [$field => $order];
      } elseif (!empty($this->options['via'])) {
        foreach ($field as $key => $val) {
          if (is_numeric($key)) {
            $field[$key] = $this->options['via'] . '.' . $val;
          } else {
            $field[$this->options['via'] . '.' . $key] = $val;
            unset($field[$key]);
          }
        }
      }
      if (!isset($this->options['order'])) {
        $this->options['order'] = [];
      }
      if (is_array($field)) {
        $this->options['order'] = array_merge($this->options['order'], $field);
      } else {
        $this->options['order'][] = $field;
      }
    }
    return $this;
  }

  /**
   * 查询缓存
   * @access public
   * @param mixed   $key    缓存key
   * @param integer $expire 缓存有效期
   * @param string  $tag    缓存标签
   * @return $this
   */
  public function cache($key = true, $expire = null, $tag = null)
  {
    // 增加快捷调用方式 cache(10) 等同于 cache(true, 10)
    if (is_numeric($key) && is_null($expire)) {
      $expire = $key;
      $key    = true;
    }
    if (false !== $key) {
      $this->options['cache'] = ['key' => $key, 'expire' => $expire, 'tag' => $tag];
    }
    return $this;
  }

  /**
   * 指定group查询
   * @access public
   * @param string $group GROUP
   * @return $this
   */
  public function group($group)
  {
    $this->options['group'] = $group;
    return $this;
  }

  /**
   * 指定having查询
   * @access public
   * @param string $having having
   * @return $this
   */
  public function having($having)
  {
    $this->options['having'] = $having;
    return $this;
  }

  /**
   * 指定查询lock
   * @access public
   * @param boolean $lock 是否lock
   * @return $this
   */
  public function lock($lock = false)
  {
    $this->options['lock']   = $lock;
    $this->options['master'] = true;
    return $this;
  }

  /**
   * 指定distinct查询
   * @access public
   * @param string $distinct 是否唯一
   * @return $this
   */
  public function distinct($distinct)
  {
    $this->options['distinct'] = $distinct;
    return $this;
  }

  /**
   * 指定数据表别名
   * @access public
   * @param mixed $alias 数据表别名
   * @return $this
   */
  public function alias($alias)
  {
    if (is_array($alias)) {
      foreach ($alias as $key => $val) {
        $this->options['alias'][$key] = $val;
      }
    } else {
      if (isset($this->options['table'])) {
        $table = is_array($this->options['table']) ? key($this->options['table']) : $this->options['table'];
        if (false !== strpos($table, '__')) {
          $table = $this->parseSqlTable($table);
        }
      } else {
        $table = $this->getTable();
      }

      $this->options['alias'][$table] = $alias;
    }
    return $this;
  }

  /**
   * 指定强制索引
   * @access public
   * @param string $force 索引名称
   * @return $this
   */
  public function force($force)
  {
    $this->options['force'] = $force;
    return $this;
  }

  /**
   * 查询注释
   * @access public
   * @param string $comment 注释
   * @return $this
   */
  public function comment($comment)
  {
    $this->options['comment'] = $comment;
    return $this;
  }

  /**
   * 获取执行的SQL语句
   * @access public
   * @param boolean $fetch 是否返回sql
   * @return $this
   */
  public function fetchSql($fetch = true)
  {
    $this->options['fetch_sql'] = $fetch;
    return $this;
  }

  /**
   * 不主动获取数据集
   * @access public
   * @param bool $pdo 是否返回 PDOStatement 对象
   * @return $this
   */
  public function fetchPdo($pdo = true)
  {
    $this->options['fetch_pdo'] = $pdo;
    return $this;
  }

  /**
   * 设置从主服务器读取数据
   * @access public
   * @return $this
   */
  public function master()
  {
    $this->options['master'] = true;
    return $this;
  }

  /**
   * 设置是否严格检查字段名
   * @access public
   * @param bool $strict 是否严格检查字段
   * @return $this
   */
  public function strict($strict = true)
  {
    $this->options['strict'] = $strict;
    return $this;
  }

  /**
   * 设置查询数据不存在是否抛出异常
   * @access public
   * @param bool $fail 数据不存在是否抛出异常
   * @return $this
   */
  public function failException($fail = true)
  {
    $this->options['fail'] = $fail;
    return $this;
  }

  /**
   * 设置自增序列名
   * @access public
   * @param string $sequence 自增序列名
   * @return $this
   */
  public function sequence($sequence = null)
  {
    $this->options['sequence'] = $sequence;
    return $this;
  }

  /**
   * 指定数据表主键
   * @access public
   * @param string $pk 主键
   * @return $this
   */
  public function pk($pk)
  {
    $this->pk = $pk;
    return $this;
  }

  /**
   * 查询日期或者时间
   * @access public
   * @param string       $field 日期字段名
   * @param string       $op    比较运算符或者表达式
   * @param string|array $range 比较范围
   * @return $this
   */
  public function whereTime($field, $op, $range = null)
  {
    if (is_null($range)) {
      // 使用日期表达式
      $date = getdate();
      switch (strtolower($op)) {
        case 'today':
        case 'd':
          $range = ['today', 'tomorrow'];
          break;
        case 'week':
        case 'w':
          $range = 'this week 00:00:00';
          break;
        case 'month':
        case 'm':
          $range = mktime(0, 0, 0, $date['mon'], 1, $date['year']);
          break;
        case 'year':
        case 'y':
          $range = mktime(0, 0, 0, 1, 1, $date['year']);
          break;
        case 'yesterday':
          $range = ['yesterday', 'today'];
          break;
        case 'last week':
          $range = ['last week 00:00:00', 'this week 00:00:00'];
          break;
        case 'last month':
          $range = [date('y-m-01', strtotime('-1 month')), mktime(0, 0, 0, $date['mon'], 1, $date['year'])];
          break;
        case 'last year':
          $range = [mktime(0, 0, 0, 1, 1, $date['year'] - 1), mktime(0, 0, 0, 1, 1, $date['year'])];
          break;
        default:
          $range = $op;
      }
      $op = is_array($range) ? 'between' : '>';
    }
    $this->where($field, strtolower($op) . ' time', $range);
    return $this;
  }

  /**
   * 获取数据表信息
   * @access public
   * @param mixed  $tableName 数据表名 留空自动获取
   * @param string $fetch     获取信息类型 包括 fields type bind pk
   * @return mixed
   */
  public function getTableInfo($tableName = '', $fetch = '')
  {
    if (!$tableName) {
      $tableName = $this->getTable();
    }
    if (is_array($tableName)) {
      $tableName = key($tableName) ?: current($tableName);
    }

    if (strpos($tableName, ',')) {
      // 多表不获取字段信息
      return false;
    } else {
      $tableName = $this->parseSqlTable($tableName);
    }

    // 修正子查询作为表名的问题
    if (strpos($tableName, ')')) {
      return [];
    }

    list($guid) = explode(' ', $tableName);
    $db         = $this->getConfig('database');
    if (!isset(self::$info[$db . '.' . $guid])) {
      if (!strpos($guid, '.')) {
        $schema = $db . '.' . $guid;
      } else {
        $schema = $guid;
      }
      // 读取缓存
      if (is_file(RUNTIME_PATH . 'schema/' . $schema . '.php')) {
        $info = include RUNTIME_PATH . 'schema/' . $schema . '.php';
      } else {
        $info = $this->connection->getFields($guid);
      }
      $fields = array_keys($info);
      $bind   = $type   = [];
      foreach ($info as $key => $val) {
        // 记录字段类型
        $type[$key] = $val['type'];
        $bind[$key] = $this->getFieldBindType($val['type']);
        if (!empty($val['primary'])) {
          $pk[] = $key;
        }
      }
      if (isset($pk)) {
        // 设置主键
        $pk = count($pk) > 1 ? $pk : $pk[0];
      } else {
        $pk = null;
      }
      self::$info[$db . '.' . $guid] = ['fields' => $fields, 'type' => $type, 'bind' => $bind, 'pk' => $pk];
    }
    return $fetch ? self::$info[$db . '.' . $guid][$fetch] : self::$info[$db . '.' . $guid];
  }

  /**
   * 获取当前数据表的主键
   * @access public
   * @param string|array $options 数据表名或者查询参数
   * @return string|array
   */
  public function getPk($options = '')
  {
    if (!empty($this->pk)) {
      $pk = $this->pk;
    } else {
      $pk = $this->getTableInfo(is_array($options) ? $options['table'] : $options, 'pk');
    }
    return $pk;
  }

  // 获取当前数据表字段信息
  public function getTableFields($options)
  {
    return $this->getTableInfo($options['table'], 'fields');
  }

  // 获取当前数据表字段类型
  public function getFieldsType($options)
  {
    return $this->getTableInfo($options['table'], 'type');
  }

  // 获取当前数据表绑定信息
  public function getFieldsBind($options)
  {
    $types = $this->getFieldsType($options);
    $bind  = [];
    if ($types) {
      foreach ($types as $key => $type) {
        $bind[$key] = $this->getFieldBindType($type);
      }
    }
    return $bind;
  }

  /**
   * 获取字段绑定类型
   * @access public
   * @param string $type 字段类型
   * @return integer
   */
  protected function getFieldBindType($type)
  {
    if (preg_match('/(int|double|float|decimal|real|numeric|serial|bit)/is', $type)) {
      $bind = PDO::PARAM_INT;
    } elseif (preg_match('/bool/is', $type)) {
      $bind = PDO::PARAM_BOOL;
    } else {
      $bind = PDO::PARAM_STR;
    }
    return $bind;
  }

  /**
   * 参数绑定
   * @access public
   * @param mixed   $key   参数名
   * @param mixed   $value 绑定变量值
   * @param integer $type  绑定类型
   * @return $this
   */
  public function bind($key, $value = false, $type = PDO::PARAM_STR)
  {
    if (is_array($key)) {
      $this->bind = array_merge($this->bind, $key);
    } else {
      $this->bind[$key] = [$value, $type];
    }
    return $this;
  }

  /**
   * 检测参数是否已经绑定
   * @access public
   * @param string $key 参数名
   * @return bool
   */
  public function isBind($key)
  {
    return isset($this->bind[$key]);
  }

  /**
   * 查询参数赋值
   * @access protected
   * @param array $options 表达式参数
   * @return $this
   */
  protected function options(array $options)
  {
    $this->options = $options;
    return $this;
  }

  /**
   * 获取当前的查询参数
   * @access public
   * @param string $name 参数名
   * @return mixed
   */
  public function getOptions($name = '')
  {
    if ('' === $name) {
      return $this->options;
    } else {
      return isset($this->options[$name]) ? $this->options[$name] : null;
    }
  }

  /**
   * 设置关联查询JOIN预查询
   * @access public
   * @param string|array $with 关联方法名称
   * @return $this
   */
  public function with($with)
  {
    if (empty($with)) {
      return $this;
    }

    if (is_string($with)) {
      $with = explode(',', $with);
    }

    $first        = true;
    $currentModel = $this->model;

    /** @var Model $class */
    $class = new $currentModel;
    foreach ($with as $key => $relation) {
      $subRelation = '';
      $closure     = false;
      if ($relation instanceof \Closure) {
        // 支持闭包查询过滤关联条件
        $closure    = $relation;
        $relation   = $key;
        $with[$key] = $key;
      } elseif (is_string($relation) && strpos($relation, '.')) {
        $with[$key]                   = $relation;
        list($relation, $subRelation) = explode('.', $relation, 2);
      }

      /** @var Relation $model */
      $relation = Loader::parseName($relation, 1, false);
      $model    = $class->$relation();
      if ($model instanceof OneToOne && 0 == $model->getEagerlyType()) {
        $model->eagerly($this, $relation, $subRelation, $closure, $first);
        $first = false;
      } elseif ($closure) {
        $with[$key] = $closure;
      }
    }
    $this->via();
    if (isset($this->options['with'])) {
      $this->options['with'] = array_merge($this->options['with'], $with);
    } else {
      $this->options['with'] = $with;
    }
    return $this;
  }

  /**
   * 关联统计
   * @access public
   * @param string|array $relation 关联方法名
   * @param bool         $subQuery 是否使用子查询
   * @return $this
   */
  public function withCount($relation, $subQuery = true)
  {
    if (!$subQuery) {
      $this->options['with_count'] = $relation;
    } else {
      $relations = is_string($relation) ? explode(',', $relation) : $relation;
      if (!isset($this->options['field'])) {
        $this->field('*');
      }
      foreach ($relations as $key => $relation) {
        $closure = false;
        if ($relation instanceof \Closure) {
          $closure  = $relation;
          $relation = $key;
        }
        $relation = Loader::parseName($relation, 1, false);
        $count    = '(' . (new $this->model)->$relation()->getRelationCountQuery($closure) . ')';
        $this->field([$count => Loader::parseName($relation) . '_count']);
      }
    }
    return $this;
  }

  /**
   * 关联预加载中 获取关联指定字段值
   * example:
   * Model::with(['relation' => function($query){
   *     $query->withField("id,name");
   * }])
   *
   * @param string | array $field 指定获取的字段
   * @return $this
   */
  public function withField($field)
  {
    $this->options['with_field'] = $field;
    return $this;
  }

  /**
   * 设置当前字段添加的表别名
   * @access public
   * @param string $via
   * @return $this
   */
  public function via($via = '')
  {
    $this->options['via'] = $via;
    return $this;
  }

  /**
   * 设置关联查询
   * @access public
   * @param string|array $relation 关联名称
   * @return $this
   */
  public function relation($relation)
  {
    if (empty($relation)) {
      return $this;
    }
    if (is_string($relation)) {
      $relation = explode(',', $relation);
    }
    if (isset($this->options['relation'])) {
      $this->options['relation'] = array_mrege($this->options['relation'], $relation);
    } else {
      $this->options['relation'] = $relation;
    }
    return $this;
  }

  /**
   * 把主键值转换为查询条件 支持复合主键
   * @access public
   * @param array|string $data    主键数据
   * @param mixed        $options 表达式参数
   * @return void
   * @throws Exception
   */
  protected function parsePkWhere($data, &$options)
  {
    $pk = $this->getPk($options);
    // 获取当前数据表
    $table = is_array($options['table']) ? key($options['table']) : $options['table'];
    if (!empty($options['alias'][$table])) {
      $alias = $options['alias'][$table];
    }
    if (is_string($pk)) {
      $key = isset($alias) ? $alias . '.' . $pk : $pk;
      // 根据主键查询
      if (is_array($data)) {
        $where[$key] = isset($data[$pk]) ? $data[$pk] : ['in', $data];
      } else {
        $where[$key] = strpos($data, ',') ? ['IN', $data] : $data;
      }
    } elseif (is_array($pk) && is_array($data) && !empty($data)) {
      // 根据复合主键查询
      foreach ($pk as $key) {
        if (isset($data[$key])) {
          $attr         = isset($alias) ? $alias . '.' . $key : $key;
          $where[$attr] = $data[$key];
        } else {
          throw new Exception('miss complex primary data');
        }
      }
    }

    if (!empty($where)) {
      if (isset($options['where']['AND'])) {
        $options['where']['AND'] = array_merge($options['where']['AND'], $where);
      } else {
        $options['where']['AND'] = $where;
      }
    }
    return;
  }

  /**
   * 插入记录
   * @access public
   * @param mixed   $data         数据
   * @param boolean $replace      是否replace
   * @param boolean $getLastInsID 返回自增主键
   * @param string  $sequence     自增序列名
   * @return integer|string
   */
  public function insert(array $data = [], $replace = false, $getLastInsID = false, $sequence = null)
  {
    // 分析查询表达式
    $options = $this->parseExpress();
    $data    = array_merge($options['data'], $data);
    // 生成SQL语句
    $sql = $this->builder->insert($data, $options, $replace);
    // 获取参数绑定
    $bind = $this->getBind();
    if ($options['fetch_sql']) {
      // 获取实际执行的SQL语句
      return $this->connection->getRealSql($sql, $bind);
    }

    // 执行操作
    $result = $this->execute($sql, $bind);
    if ($result) {
      $this->trigger('after_insert', $options);
    }
    if ($getLastInsID) {
      $sequence = $sequence ?: (isset($options['sequence']) ? $options['sequence'] : null);
      return $this->getLastInsID($sequence);
    }
    return $result;
  }

  /**
   * 插入记录并获取自增ID
   * @access public
   * @param mixed   $data     数据
   * @param boolean $replace  是否replace
   * @param string  $sequence 自增序列名
   * @return integer|string
   */
  public function insertGetId(array $data, $replace = false, $sequence = null)
  {
    return $this->insert($data, $replace, true, $sequence);
  }

  /**
   * 批量插入记录
   * @access public
   * @param mixed $dataSet 数据集
   * @return integer|string
   */
  public function insertAll(array $dataSet)
  {
    // 分析查询表达式
    $options = $this->parseExpress();
    if (!is_array(reset($dataSet))) {
      return false;
    }
    // 生成SQL语句
    $sql = $this->builder->insertAll($dataSet, $options);
    // 获取参数绑定
    $bind = $this->getBind();
    if ($options['fetch_sql']) {
      // 获取实际执行的SQL语句
      return $this->connection->getRealSql($sql, $bind);
    } else {
      // 执行操作
      return $this->execute($sql, $bind);
    }
  }

  /**
   * 通过Select方式插入记录
   * @access public
   * @param string $fields 要插入的数据表字段名
   * @param string $table  要插入的数据表名
   * @return integer|string
   * @throws PDOException
   */
  public function selectInsert($fields, $table)
  {
    // 分析查询表达式
    $options = $this->parseExpress();
    // 生成SQL语句
    $table = $this->parseSqlTable($table);
    $sql   = $this->builder->selectInsert($fields, $table, $options);
    // 获取参数绑定
    $bind = $this->getBind();
    if ($options['fetch_sql']) {
      // 获取实际执行的SQL语句
      return $this->connection->getRealSql($sql, $bind);
    } else {
      // 执行操作
      return $this->execute($sql, $bind);
    }
  }

  /**
   * 更新记录
   * @access public
   * @param mixed $data 数据
   * @return integer|string
   * @throws Exception
   * @throws PDOException
   */
  public function update(array $data = [])
  {
    $options = $this->parseExpress();
    $data    = array_merge($options['data'], $data);
    $pk      = $this->getPk($options);
    if (isset($options['cache']) && is_string($options['cache'])) {
      $key = $options['cache'];
    }

    if (empty($options['where'])) {
      // 如果存在主键数据 则自动作为更新条件
      if (is_string($pk) && isset($data[$pk])) {
        $where[$pk] = $data[$pk];
        if (!isset($key)) {
          $key = 'think:' . $options['table'] . '|' . $data[$pk];
        }
        unset($data[$pk]);
      } elseif (is_array($pk)) {
        // 增加复合主键支持
        foreach ($pk as $field) {
          if (isset($data[$field])) {
            $where[$field] = $data[$field];
          } else {
            // 如果缺少复合主键数据则不执行
            throw new Exception('miss complex primary data');
          }
          unset($data[$field]);
        }
      }
      if (!isset($where)) {
        // 如果没有任何更新条件则不执行
        throw new Exception('miss update condition');
      } else {
        $options['where']['AND'] = $where;
      }
    } elseif (is_string($pk) && isset($options['where']['AND'][$pk]) && is_scalar($options['where']['AND'][$pk])) {
      $key = 'think:' . $options['table'] . '|' . $options['where']['AND'][$pk];
    }
    // 生成UPDATE SQL语句
    $sql = $this->builder->update($data, $options);
    // 获取参数绑定
    $bind = $this->getBind();
    if ($options['fetch_sql']) {
      // 获取实际执行的SQL语句
      return $this->connection->getRealSql($sql, $bind);
    } else {
      // 检测缓存
      if (isset($key) && Cache::get($key)) {
        // 删除缓存
        Cache::rm($key);
      }
      // 执行操作
      $result = '' == $sql ? 0 : $this->execute($sql, $bind);
      if ($result) {
        $this->trigger('after_update', $options);
      }
      return $result;
    }
  }

  /**
   * 执行查询但只返回PDOStatement对象
   * @access public
   * @return \PDOStatement|string
   */
  public function getPdo()
  {
    // 分析查询表达式
    $options = $this->parseExpress();
    // 生成查询SQL
    $sql = $this->builder->select($options);
    // 获取参数绑定
    $bind = $this->getBind();
    if ($options['fetch_sql']) {
      // 获取实际执行的SQL语句
      return $this->connection->getRealSql($sql, $bind);
    }
    // 执行查询操作
    return $this->query($sql, $bind, $options['master'], true);
  }

  /**
   * 查找记录
   * @access public
   * @param array|string|Query|\Closure $data
   * @return Collection|false|\PDOStatement|string
   * @throws DbException
   * @throws ModelNotFoundException
   * @throws DataNotFoundException
   */
  public function select($data = null)
  {
    if ($data instanceof Query) {
      return $data->select();
    } elseif ($data instanceof \Closure) {
      call_user_func_array($data, [&$this]);
      $data = null;
    }
    // 分析查询表达式
    $options = $this->parseExpress();

    if (false === $data) {
      // 用于子查询 不查询只返回SQL
      $options['fetch_sql'] = true;
    } elseif (!is_null($data)) {
      // 主键条件分析
      $this->parsePkWhere($data, $options);
    }

    $resultSet = false;
    if (empty($options['fetch_sql']) && !empty($options['cache'])) {
      // 判断查询缓存
      $cache = $options['cache'];
      unset($options['cache']);
      $key       = is_string($cache['key']) ? $cache['key'] : md5(serialize($options));
      $resultSet = Cache::get($key);
    }
    if (!$resultSet) {
      // 生成查询SQL
      $sql = $this->builder->select($options);
      // 获取参数绑定
      $bind = $this->getBind();
      if ($options['fetch_sql']) {
        // 获取实际执行的SQL语句
        return $this->connection->getRealSql($sql, $bind);
      }
      if ($resultSet = $this->trigger('before_select', $options)) {
      } else {
        // 执行查询操作
        $resultSet = $this->query($sql, $bind, $options['master'], $options['fetch_pdo']);

        if ($resultSet instanceof \PDOStatement) {
          // 返回PDOStatement对象
          return $resultSet;
        }
      }

      if (isset($cache)) {
        // 缓存数据集
        if (isset($cache['tag'])) {
          Cache::tag($cache['tag'])->set($key, $resultSet, $cache['expire']);
        } else {
          Cache::set($key, $resultSet, $cache['expire']);
        }
      }
    }

    // 数据列表读取后的处理
    if (!empty($this->model)) {
      // 生成模型对象
      $modelName = $this->model;
      if (count($resultSet) > 0) {
        foreach ($resultSet as $key => $result) {
          /** @var Model $result */
          $model = new $modelName($result);
          $model->isUpdate(true);

          // 关联查询
          if (!empty($options['relation'])) {
            $model->relationQuery($options['relation']);
          }
          // 关联统计
          if (!empty($options['with_count'])) {
            $model->relationCount($model, $options['with_count']);
          }
          $resultSet[$key] = $model;
        }
        if (!empty($options['with'])) {
          // 预载入
          $model->eagerlyResultSet($resultSet, $options['with']);
        }
        // 模型数据集转换
        $resultSet = $model->toCollection($resultSet);
      } else {
        $resultSet = (new $modelName)->toCollection($resultSet);
      }
    } elseif ('collection' == $this->connection->getConfig('resultset_type')) {
      // 返回Collection对象
      $resultSet = new Collection($resultSet);
    }
    // 返回结果处理
    if (!empty($options['fail']) && count($resultSet) == 0) {
      $this->throwNotFound($options);
    }
    return $resultSet;
  }

  /**
   * 查找单条记录
   * @access public
   * @param array|string|Query|\Closure $data
   * @return array|false|\PDOStatement|string|Model
   * @throws DbException
   * @throws ModelNotFoundException
   * @throws DataNotFoundException
   */
  public function find($data = null)
  {
    if ($data instanceof Query) {
      return $data->find();
    } elseif ($data instanceof \Closure) {
      call_user_func_array($data, [&$this]);
      $data = null;
    }
    // 分析查询表达式
    $options = $this->parseExpress();

    if (!is_null($data)) {
      // AR模式分析主键条件
      $this->parsePkWhere($data, $options);
    }

    $options['limit'] = 1;
    $result           = false;
    if (empty($options['fetch_sql']) && !empty($options['cache'])) {
      // 判断查询缓存
      $cache = $options['cache'];
      if (true === $cache['key'] && !is_null($data) && !is_array($data)) {
        $key = 'think:' . (is_array($options['table']) ? key($options['table']) : $options['table']) . '|' . $data;
      } else {
        $key = is_string($cache['key']) ? $cache['key'] : md5(serialize($options));
      }
      $result = Cache::get($key);
    }
    if (!$result) {
      // 生成查询SQL
      $sql = $this->builder->select($options);
      // 获取参数绑定
      $bind = $this->getBind();
      if ($options['fetch_sql']) {
        // 获取实际执行的SQL语句
        return $this->connection->getRealSql($sql, $bind);
      }

      // 事件回调
      if ($result = $this->trigger('before_find', $options)) {
      } else {
        // 执行查询
        $result = $this->query($sql, $bind, $options['master'], $options['fetch_pdo']);

        if ($result instanceof \PDOStatement) {
          // 返回PDOStatement对象
          return $result;
        }
      }

      if (isset($cache)) {
        // 缓存数据
        if (isset($cache['tag'])) {
          Cache::tag($cache['tag'])->set($key, $result, $cache['expire']);
        } else {
          Cache::set($key, $result, $cache['expire']);
        }
      }
    }

    // 数据处理
    if (!empty($result[0])) {
      $data = $result[0];
      if (!empty($this->model)) {
        // 返回模型对象
        $model = $this->model;
        $data  = new $model($data);
        $data->isUpdate(true, isset($options['where']['AND']) ? $options['where']['AND'] : null);
        // 关联查询
        if (!empty($options['relation'])) {
          $data->relationQuery($options['relation']);
        }
        // 预载入查询
        if (!empty($options['with'])) {
          $data->eagerlyResult($data, $options['with']);
        }
        // 关联统计
        if (!empty($options['with_count'])) {
          $data->relationCount($data, $options['with_count']);
        }
      }
    } elseif (!empty($options['fail'])) {
      $this->throwNotFound($options);
    } else {
      $data = null;
    }
    return $data;
  }

  /**
   * 查询失败 抛出异常
   * @access public
   * @param array $options 查询参数
   * @throws ModelNotFoundException
   * @throws DataNotFoundException
   */
  protected function throwNotFound($options = [])
  {
    if (!empty($this->model)) {
      throw new ModelNotFoundException('model data Not Found:' . $this->model, $this->model, $options);
    } else {
      $table = is_array($options['table']) ? key($options['table']) : $options['table'];
      throw new DataNotFoundException('table data not Found:' . $table, $table, $options);
    }
  }

  /**
   * 查找多条记录 如果不存在则抛出异常
   * @access public
   * @param array|string|Query|\Closure $data
   * @return array|\PDOStatement|string|Model
   * @throws DbException
   * @throws ModelNotFoundException
   * @throws DataNotFoundException
   */
  public function selectOrFail($data = null)
  {
    return $this->failException(true)->select($data);
  }

  /**
   * 查找单条记录 如果不存在则抛出异常
   * @access public
   * @param array|string|Query|\Closure $data
   * @return array|\PDOStatement|string|Model
   * @throws DbException
   * @throws ModelNotFoundException
   * @throws DataNotFoundException
   */
  public function findOrFail($data = null)
  {
    return $this->failException(true)->find($data);
  }

  /**
   * 分批数据返回处理
   * @access public
   * @param integer  $count    每次处理的数据数量
   * @param callable $callback 处理回调方法
   * @param string   $column   分批处理的字段名
   * @return boolean
   */
  public function chunk($count, $callback, $column = null)
  {
    $options = $this->getOptions();
    if (isset($options['table'])) {
      $table = is_array($options['table']) ? key($options['table']) : $options['table'];
    } else {
      $table = '';
    }
    $column    = $column ?: $this->getPk($table);
    $bind      = $this->bind;
    $resultSet = $this->limit($count)->order($column, 'asc')->select();
    if (strpos($column, '.')) {
      list($alias, $key) = explode('.', $column);
    } else {
      $key = $column;
    }
    if ($resultSet instanceof Collection) {
      $resultSet = $resultSet->all();
    }

    while (!empty($resultSet)) {
      if (false === call_user_func($callback, $resultSet)) {
        return false;
      }
      $end       = end($resultSet);
      $lastId    = is_array($end) ? $end[$key] : $end->$key;
      $resultSet = $this->options($options)
        ->limit($count)
        ->bind($bind)
        ->where($column, '>', $lastId)
        ->order($column, 'asc')
        ->select();
      if ($resultSet instanceof Collection) {
        $resultSet = $resultSet->all();
      }
    }
    return true;
  }

  /**
   * 获取绑定的参数 并清空
   * @access public
   * @return array
   */
  public function getBind()
  {
    $bind       = $this->bind;
    $this->bind = [];
    return $bind;
  }

  /**
   * 创建子查询SQL
   * @access public
   * @param bool $sub
   * @return string
   * @throws DbException
   */
  public function buildSql($sub = true)
  {
    return $sub ? '( ' . $this->select(false) . ' )' : $this->select(false);
  }

  /**
   * 删除记录
   * @access public
   * @param mixed $data 表达式 true 表示强制删除
   * @return int
   * @throws Exception
   * @throws PDOException
   */
  public function delete($data = null)
  {
    // 分析查询表达式
    $options = $this->parseExpress();
    if (isset($options['cache']) && is_string($options['cache'])) {
      $key = $options['cache'];
    }

    if (!is_null($data) && true !== $data) {
      if (!isset($key) && !is_array($data)) {
        // 缓存标识
        $key = 'think:' . $options['table'] . '|' . $data;
      }
      // AR模式分析主键条件
      $this->parsePkWhere($data, $options);
    }

    if (true !== $data && empty($options['where'])) {
      // 如果条件为空 不进行删除操作 除非设置 1=1
      throw new Exception('delete without condition');
    }
    // 生成删除SQL语句
    $sql = $this->builder->delete($options);
    // 获取参数绑定
    $bind = $this->getBind();
    if ($options['fetch_sql']) {
      // 获取实际执行的SQL语句
      return $this->connection->getRealSql($sql, $bind);
    }

    // 检测缓存
    if (isset($key) && Cache::get($key)) {
      // 删除缓存
      Cache::rm($key);
    }
    // 执行操作
    $result = $this->execute($sql, $bind);
    if ($result) {
      $this->trigger('after_delete', $options);
    }
    return $result;
  }

  /**
   * 分析表达式（可用于查询或者写入操作）
   * @access protected
   * @return array
   */
  protected function parseExpress()
  {
    $options = $this->options;

    // 获取数据表
    if (empty($options['table'])) {
      $options['table'] = $this->getTable();
    }

    if (!isset($options['where'])) {
      $options['where'] = [];
    } elseif (isset($options['view'])) {
      // 视图查询条件处理
      foreach (['AND', 'OR'] as $logic) {
        if (isset($options['where'][$logic])) {
          foreach ($options['where'][$logic] as $key => $val) {
            if (array_key_exists($key, $options['map'])) {
              $options['where'][$logic][$options['map'][$key]] = $val;
              unset($options['where'][$logic][$key]);
            }
          }
        }
      }

      if (isset($options['order'])) {
        // 视图查询排序处理
        if (is_string($options['order'])) {
          $options['order'] = explode(',', $options['order']);
        }
        foreach ($options['order'] as $key => $val) {
          if (is_numeric($key)) {
            if (strpos($val, ' ')) {
              list($field, $sort) = explode(' ', $val);
              if (array_key_exists($field, $options['map'])) {
                $options['order'][$options['map'][$field]] = $sort;
                unset($options['order'][$key]);
              }
            } elseif (array_key_exists($val, $options['map'])) {
              $options['order'][$options['map'][$val]] = 'asc';
              unset($options['order'][$key]);
            }
          } elseif (array_key_exists($key, $options['map'])) {
            $options['order'][$options['map'][$key]] = $val;
            unset($options['order'][$key]);
          }
        }
      }
    }

    if (!isset($options['field'])) {
      $options['field'] = '*';
    }

    if (!isset($options['data'])) {
      $options['data'] = [];
    }

    if (!isset($options['strict'])) {
      $options['strict'] = $this->getConfig('fields_strict');
    }

    foreach (['master', 'lock', 'fetch_pdo', 'fetch_sql', 'distinct'] as $name) {
      if (!isset($options[$name])) {
        $options[$name] = false;
      }
    }

    foreach (['join', 'union', 'group', 'having', 'limit', 'order', 'force', 'comment'] as $name) {
      if (!isset($options[$name])) {
        $options[$name] = '';
      }
    }

    if (isset($options['page'])) {
      // 根据页数计算limit
      list($page, $listRows) = $options['page'];
      $page                  = $page > 0 ? $page : 1;
      $listRows              = $listRows > 0 ? $listRows : (is_numeric($options['limit']) ? $options['limit'] : 20);
      $offset                = $listRows * ($page - 1);
      $options['limit']      = $offset . ',' . $listRows;
    }

    $this->options = [];
    return $options;
  }

  /**
   * 注册回调方法
   * @access public
   * @param string   $event    事件名
   * @param callable $callback 回调方法
   * @return void
   */
  public static function event($event, $callback)
  {
    self::$event[$event] = $callback;
  }

  /**
   * 触发事件
   * @access protected
   * @param string $event   事件名
   * @param mixed  $options 当前查询参数
   * @return bool
   */
  protected function trigger($event, $options = [])
  {
    $result = false;
    if (isset(self::$event[$event])) {
      $callback = self::$event[$event];
      $result   = call_user_func_array($callback, [$options, $this]);
    }
    return $result;
  }
}
